both open all and open selected are now fast, also fixed a bug with onebag and maybe other inventory addons where items wouldn't be grayed out right when locked

util.lua

@@ -0,0 +1,83 @@
+Postal.util = {}
+
+function Postal.util.set_add(set, key)
+    set[key] = true
+end
+
+function Postal.util.set_remove(set, key)
+    set[key] = nil
+end
+
+function Postal.util.set_contains(set, key)
+    return set[key] ~= nil
+end
+
+function Postal.util.set_size(set)
+    local size = 0
+	for _,_ in pairs(set) do
+		size = size + 1
+	end
+	return size
+end
+
+function Postal.util.set_to_array(set)
+	local array = {}
+	for element, _ in pairs(set) do
+		tinsert(array, element)
+	end
+	return array
+end
+
+function Postal.util.any(xs, p)
+	holds = false
+	for _, x in ipairs(xs) do
+		holds = holds or p(x)
+	end
+	return holds
+end
+
+function Postal.util.all(xs, p)
+	holds = true
+	for _, x in ipairs(xs) do
+		holds = holds and p(x)
+	end
+	return holds
+end
+
+function Postal.util.set_filter(xs, p)
+	ys = {}
+	for x, _ in pairs(xs) do
+		if p(x) then
+			Postal.util.set_add(ys, x)
+		end
+	end
+	return ys
+end
+
+function Postal.util.filter(xs, p)
+	ys = {}
+	for _, x in ipairs(xs) do
+		if p(x) then
+			tinsert(ys, x)
+		end
+	end
+	return ys
+end
+
+function Postal.util.map(xs, f)
+	ys = {}
+	for _, x in ipairs(xs) do
+		tinsert(ys, f(x))
+	end
+	return ys
+end
+
+function Postal.util.take(n, xs)
+	ys = {}
+	for i=1,n do
+		if xs[i] then
+			tinsert(ys, xs[i])
+		end
+	end
+	return ys
+end